The Combined Chiefs of Staff (CCS) was the supreme military staff for the United States and Britain during World War II. It set all the major policy decisions for the two nations, subject to the approvals of British Prime Minister Winston Churchill and U.S. President Franklin D. Roosevelt. It emerged from the meetings of the Arcadia Conference in Washington, from December 22, 1941 to January 14, 1942. Shortly after Pearl Harbor, Prime Minister Churchill and his senior military staff used Arcadia as an opportunity to lay out the general strategy for the war. The American Army Chief of Staff George Marshall came up with the idea of a combined board, and sold it to Roosevelt and together the two sold the idea to Churchill. Churchill's military aides were much less favorable, and General Alan Brooke, the chief of the British Armed Forces, was strongly opposed. Brooke believed that if the Western Allies were placed under international unified commands the United States would become dominant, and also feared that the situation of the CCS in Washington D.C. would leave Britain unable to initiate military policy. However, Brooke was left behind in London to handle the daily details of running the British war effort, and was not consulted. Charles de Gaulle requested Free French representation on the committee but was declined along with the other Western Allies. As part of Marshall's plan, Roosevelt also set up a Joint Chiefs of Staff on the American side. The combined board was permanently stationed at the United States Public Health Service Building in Washington, where Field Marshal John Dill represented the British half. The CCS was constituted from the British Chiefs of Staff Committee and the American Joint Chiefs of Staff, The American unit was created in part to present a common front to the British Chiefs of Staff. It held its first formal meeting on 9 February 1942 to coordinate U.S. military operations between War and Navy Departments. The CCS charter was approved by President Roosevelt 21 April 1942.